iommu/rockchip: Fix error handling in init

It's hard to undo bus_set_iommu() in the error path, so move it to the
end of rk_iommu_probe().

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/rockchip-iommu.c

@@ -1133,6 +1133,8 @@ static int rk_iommu_probe(struct platform_device *pdev)
 	if (!dma_dev)
 		dma_dev = &pdev->dev;
 
+	bus_set_iommu(&platform_bus_type, &rk_iommu_ops);
+
 	return 0;
 err_remove_sysfs:
 	iommu_device_sysfs_remove(&iommu->iommu);
@@ -1176,19 +1178,6 @@ static struct platform_driver rk_iommu_driver = {
 
 static int __init rk_iommu_init(void)
 {
-	struct device_node *np;
-	int ret;
-
-	np = of_find_matching_node(NULL, rk_iommu_dt_ids);
-	if (!np)
-		return 0;
-
-	of_node_put(np);
-
-	ret = bus_set_iommu(&platform_bus_type, &rk_iommu_ops);
-	if (ret)
-		return ret;
-
 	return platform_driver_register(&rk_iommu_driver);
 }
 subsys_initcall(rk_iommu_init);